Film exterior body for batteries, and battery having same

Abstract

In a battery including an electrode assembly including a positive electrode, a negative electrode, and an electrolyte layer interposed therebetween, and an exterior body, configured to hermetically house the electrode assembly, a film exterior body for a battery is used. The film exterior body for a battery includes a gas barrier layer, and a seal layer that is stacked on one surface of the gas barrier layer and includes a first resin. The gas barrier layer includes a first metal layer having a Young's modulus of 65×10 9 N/m 2 or less, and a thickness T 1 of the first metal layer is more than 5 μm and 200 μm or less.

1 . A film exterior body for a battery, comprising:
 a gas barrier layer; and   a seal layer that is stacked on one surface of the gas barrier layer, and includes a first resin,   wherein the gas barrier layer includes a first metal layer having a Young's modulus of 65×10 9  N/m 2  or less, and a thickness T 1  of the first metal layer is more than 5 μm and 200 μm or less.   
     
     
         2 . The film exterior body for a battery according to  claim 1 , wherein the first metal layer includes at least one selected from the group consisting of tin, indium, and magnesium. 
     
     
         3 . The film exterior body for a battery according to  claim 1 , wherein the thickness T 1  of the first metal layer is 80% or more with respect to a thickness T 0  of the gas barrier layer. 
     
     
         4 . The film exterior body for a battery according to  claim 1 , wherein the gas barrier layer further comprises a metal oxide layer formed on at least one surface of the first metal layer. 
     
     
         5 . The film exterior body for a battery according to  claim 1 , wherein the gas barrier layer further comprises a second metal layer, the second metal layer has a Young's modulus of more than 65×10 9  N/m 2 , and has a thickness T 2  that is less than 20% with respect to the thickness To of the gas barrier layer. 
     
     
         6 . The film exterior body for a battery according to  claim 1 , wherein the thickness T 1  of the first metal layer is 10 μm or more and 100 μm or less. 
     
     
         7 . The film exterior body for a battery according to  claim 1 , wherein the first metal layer is a rolled metal foil. 
     
     
         8 . A battery comprising:
 an electrode assembly including a positive electrode, a negative electrode, and an electrolyte layer interposed between the positive electrode and the negative electrode, and   the film exterior body for a battery according to  claim 1 , configured to hermetically house the electrode assembly.   
     
     
         9 . The battery according to  claim 8 , wherein
 the electrode assembly is a sheet-shaped stack including the positive electrode, the negative electrode, and the electrolyte layer that are stacked on each other, wherein the positive electrode and the negative electrode are formed in a sheet shape, respectively, and   a total thickness of the electrode assembly and the film exterior body for a battery is 2 mm or less.